Here is a story that I heard in church a few years ago. I found it
again today on the Internet.

A prisoner in jail receives a letter from his wife. "I have
decided to plant some lettuce in the back garden. When is the best time to plant
them?" The prisoner, knowing that the prison guards read all mail, replied in a
letter, "Dear Wife, whatever you do, do not touch the back garden. That is where I
hid all the gold."

A week or so later, he received another letter from his wife: "You wouldn't believe
what happened, some men came with shovels to the house, and dug up all the back
garden."

The prisoner wrote another letter: "Dear wife, now is the best time to plant the
lettuce."